package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkSpaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.filter.OrderedFormContentFilter;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkSpaceService workSpaceService;

    /**
     * 获取[begin, end]之间每天的营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        if(begin.equals(end))
        {
            begin = end.plusDays(-1);
            end = begin;
        }

        while (!begin.equals(end.plusDays(1))) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询date日期对应得营业额数据, 营业额是指：状态为已完成得订单金额合计
            // LocalDate只有年月日没有时分秒，而orderTime对应得LocalDateTime有时分秒
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // sql: select sum(amount) from orders where order_time >= ? and order_time <= ? and status = 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            if (turnover == null) turnover = 0.0;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 获取指定区间得用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        if(begin.equals(end))
        {
            begin = end.plusDays(-1);
            end = begin;
        }

        while (!begin.equals(end.plusDays(1))) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放每天的新增用户数量
        // select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        // 存放每天的总用户数量
        // select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            Map map = new HashMap();
            map.put("end", LocalDateTime.of(date, LocalTime.MAX));
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            map.put("begin", LocalDateTime.of(date, LocalTime.MIN));
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
        }

        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 获取指定区间的订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        if(begin.equals(end))
        {
            begin = end.plusDays(-1);
            end = begin;
        }

        while (!begin.equals(end.plusDays(1))) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        Integer orderCnt = 0, validOrderCnt = 0;
        // 遍历dateList集合，查询每天的有效订单订单数和订单总数
        for (LocalDate date : dateList) {
            Map mp = new HashMap();
            mp.put("begin", LocalDateTime.of(date, LocalTime.MIN));
            mp.put("end", LocalDateTime.of(date, LocalTime.MAX));
            // 查询每天的订单总数
            // select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = orderMapper.countByMap(mp);
            orderCountList.add(orderCount);
            orderCnt += orderCount;
            // 查询每天的有效订单数
            // select count(id) from orders where order_time > ? and order_time < ?
            // and status = 5
            mp.put("status", Orders.COMPLETED);
            Integer validOrderCount = orderMapper.countByMap(mp);
            validOrderCountList.add(validOrderCount);
            validOrderCnt += validOrderCount;
        }

        Double orderCompletionRate = 0.0;
        if (orderCnt != 0) orderCompletionRate = validOrderCnt.doubleValue() / orderCnt;

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(orderCnt)
                .validOrderCount(validOrderCnt)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量Top10统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10Statistics(LocalDate begin, LocalDate end) {
        List<GoodsSalesDTO> salesTop10List = orderMapper.getSalesTop10(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        List<String> names = salesTop10List.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10List.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response){
        // 查询数据库，获取营业数据---最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        BusinessDataVO businessDataVO = workSpaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        // 通过POI把数据写入excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            // 基于模板文件创建一个新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 获取表格文件的sheet标签页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);
            // 获得第四行并填充数据
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            // 获得第五行并填充数据
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());
            // 填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                // 查某一天的营业数据
                BusinessDataVO businessData = workSpaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                // 获得某一行
                row = sheet.getRow(i + 7);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            // 通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            // 关闭资源
            in.close();
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
